CN-121985727-A - Regulation and control method and application of semen cassiae in Pd/Co multilayer film

Abstract

The invention relates to a regulating and controlling method and application of a stigman seed in a Pd/Co multilayer film, wherein the regulating and controlling method comprises the following steps of preparing a Pd/[ Co/Pd ] x film on a substrate, wherein x is any integer of 1-5, completely overturning the prepared Pd/[ Co/Pd ] x film under a magnetic field of 100Oe to display a single magnetic domain, then introducing a mixed gas of hydrogen and inert gas, gradually increasing the concentration of the hydrogen in the mixed gas along with the time, gradually appearing and tending to saturate the stigman seed in the film, stopping supplying the hydrogen, placing the film in air for standing, and recovering the magnetic domain structure of the film to an initial state. The invention also provides application of the regulation method in the high-density nonvolatile memory. Compared with the prior art, the invention not only widens the regulating and controlling range of the Sjog seed by utilizing the reversible diffusion behavior of the hydrogen and the interface electronic structure modulation effect, but also remarkably improves the spatial resolution and the operation flexibility, and provides a brand new feasible way for realizing the spin electronic device with low power consumption and high stability.

Inventors

• HOU ZHIPENG
• XU XINXING
• ZHU YU
• AN HONGYU
• ZHANG HAOHAN

Assignees

• 华南师范大学
• 深圳技术大学

Dates

Publication Date

20260505

Application Date

20251229

Claims (8)

1. 1. A regulating and controlling method of a stigman seed in a Pd/Co multilayer film is characterized by comprising the following steps: Preparing Pd/[ Co/Pd ] x film on the substrate, wherein x is any integer of 1-5, completely turning over the prepared Pd/[ Co/Pd ] x film under a 100Oe magnetic field to display a single magnetic domain, then introducing mixed gas of hydrogen and inert gas, wherein the concentration of the hydrogen in the mixed gas gradually increases along with the time, the Siegesbeck seed in the film gradually appears and tends to be saturated, stopping supplying the hydrogen, standing the film in the air, and recovering the magnetic domain structure of the film to an initial state.
2. 2. The method of claim 1, wherein the Pd/[ Co/Pd ] x film is prepared by high vacuum magnetron sputtering.
3. 3. The method of claim 1, wherein the substrate is a Si substrate or a SiO 2 substrate.
4. 4. The method of claim 2, wherein the high vacuum magnetron sputtering system is vacuumized until the basic vacuum degree is less than or equal to 5×10 -7 Torr before the thin film is prepared, high purity argon is introduced as working gas, the working pressure is 3.5 mTorr, sputtering is carried out at normal temperature, a sample stage rotates at a rotating speed of 20 rpm during the sputtering process, a Co target is sputtered by a direct current power supply, a Pd target is sputtered by a radio frequency power supply, and the sputtering power of the two targets is set to 50W.
5. 5. The method of claim 1, wherein the Pd/Co/Pd x film has a Pd film thickness of 3-10 nm and a Co film thickness of 0.6-1.2 nm.
6. 6. The method of claim 5, wherein the Pd/Co/Pd x thin film has a Pd film thickness of 3nm and a Co film thickness of 0.9nm, and x=3.
7. 7. The method of claim 1, wherein the flow rate of the mixed gas is controlled by a flow meter to control the concentration of hydrogen in the mixed gas.
8. 8. The use of the regulation method according to any one of claims 1 to 7 in a high-density nonvolatile memory.

Description

Regulation and control method and application of semen cassiae in Pd/Co multilayer film Technical Field The invention relates to the technical field of information storage, in particular to a regulating and controlling method and application of a semen cassiae in a Pd/Co multilayer film. Background The semen cassiae (Skyrmion) is a nanoscale spin structure with topological protection characteristics, and has the advantages of high stability, small size, low driving force, topological protection, read-write capability and the like. Therefore, the spinelle is considered as an ideal information carrier of a new generation of high-density, low-power consumption magnetic storage and brain-like computing devices, and has wide application prospect in spintronics, nonvolatile storage and novel computing architecture. At present, extensive researches are conducted around the generation, stabilization and annihilation of the cassia seeds, and various regulation modes are developed. Magnetic field regulation is the earliest method used, and the generation, expansion or regression of the cassia seeds is realized by externally adding a vertical or parallel magnetic field, but the method requires higher energy consumption and is difficult to realize accurate positioning. Current-driven regulation and control utilizes spin-orbit torque (SOT) or Spin Transfer Torque (STT) to drive movement and annihilation of the cassia seed, has the advantages of quick response and easiness in electric control, but has the problems of obvious thermal effect and limited precision. The stress/strain regulation and temperature regulation method further expands the regulation means of the stigman seeds by changing the magnetic anisotropy or the exchange action intensity, but has limited universality and complex external field coupling equipment. As an emerging method, laser regulation and control is used for realizing rapid writing, annihilation or track control of the cassia seeds by using ultra-fast laser pulse instantaneous heating or photoinduction magneto-optical effect, and has high spatial resolution, but the cost is high, and the stability and energy consumption control still need to be optimized. Despite the significant progress made in the current methods of regulating and controlling the cassia seeds, there are a number of shortcomings. Firstly, the high energy consumption is a common problem, for example, the magnetic field regulation requires a strong external magnetic field, the current driving has obvious joule heating effect, and the requirement of low-power-consumption devices is difficult to meet. Secondly, the reversibility and the stability are insufficient, such as structural rearrangement or defect can be introduced in laser regulation, element doping or heat treatment, the reversibility is not realized, and the current driving mode is influenced by defect pinning, so that unstable movement behaviors are easily caused. Third, the regulation and control range and flexibility are limited, the temperature regulation and control is global generally, the local regulation and control are difficult to realize, and the temperature rising and falling speed is low, so that the high-speed response requirement cannot be met. Finally, the device integration difficulty is high, such as stress/strain regulation and laser regulation have higher requirements on equipment precision and system complexity, and the device is not beneficial to be applied to large-scale integrated circuits. Thus, the first and second substrates are bonded together, realizes the room temperature existence, small size, and the like of the cassia seed the high density of the spinodal material system remains the focus of research. Disclosure of Invention Based on the above, the invention aims to provide a regulating and controlling method and application of the stigman seeds in the Pd/Co multilayer film, which utilize hydrogen for regulating and controlling, and have unique reversibility and high flexibility. The invention aims at realizing the following technical scheme: In a first aspect, the invention provides a method for regulating and controlling the cassia seed in a Pd/Co multilayer film, which comprises the following steps: Preparing Pd/[ Co/Pd ] x film on the substrate, wherein x is any integer of 1-5, completely turning over the prepared Pd/[ Co/Pd ] x film under a 100Oe magnetic field to display a single magnetic domain, then introducing mixed gas of hydrogen and inert gas, wherein the concentration of the hydrogen in the mixed gas gradually increases along with the time, the Siegesbeck seed in the film gradually appears and tends to be saturated, stopping supplying the hydrogen, standing the film in the air, and recovering the magnetic domain structure of the film to an initial state. Compared with the prior art, the method for regulating and controlling the semen cassiae in the Pd/Co multilayer film by using the hydrogen provided by the invention has